Hoover wind tunnel

We have a wind tunnel "mach 4.7", I can't seem to find a model number. The unit turns off by itself, CONSTANTLY, after about 2 or 3 minutes of use. I keep it clean and clog free, but nothing seems to work. we even took it to a repairman who "fixed" it, which lasted about a month. The amount of dog hair it sucks up is incredible, but we run it on a pretty regular basis. We can only vacuum one room at a time because we need to let the damn thing "cool off". And we usually have to vacuum the rooms twice to get it all, so its takes all day to vacuum our house. any suggestions?
Windtunnel Ultra U6425-900 vacuum shuts off after less than a minute of vacuuming; restarts after a cooling off period. This only happens when using the floor brushes - not with attachments. Recently had switch replaced, have replaced filters and bags with Hoover brand, all to no avail. Any ideas?
Wandaq

Did you check down by the brush roll for a clog in the dirt inlet. And is the brush roll turning freely, if it is being lugged down, it can cause the motor to overheat and the thermo protector will caught it off, until the motor cools down. But if both are ok, then maybe the motor protector needs to replaced, it is prematurely tripping.

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If you turn the vacuum over there will be (4) screws that hold on the base cover for the roller brush. Remove the screws and the cover and you can get to the belt(s). You can get replacement belts here:

Take off the bottom plate covering the brush roll, 4 screws. There are 2 belts, if you replace both, put the V belt on 1st, then stretch the flat belt over the motor shaft, then over the bigger pulley along side the V belt.

I assume this is a Hoover Bagless, if poor suction, the hose or dirt inlet by the brush roll may have a clog. The filter inside the dirt container may need replacement. Some had a screw to take out to remove the cover for the filter, the one under where hte dirt container sits. Alos the belt may be stretch and won't turn the brush roll under load. Having the model number would help.

A clog or partial clog is what causes the motor to overheat, then a thermo protector will cut off and the motor will stop until it cools down. So either you do have a clog, in the hose or down by the brush roll. If they are clear, and the filters are clean, then maybe the thermo protector is bad and needs to be replaced.

Did you check the inlet from the bottom? Take the bottom plate off, make sure that the tube(inlet)is free of any clogs. Also if the belt is stretched, then it won't drive the brush roll like it should, replace it part #38528033.